Checkbox syntax highlighting stops when there are more than two digits in numbered lists

[makyo]

Prior to submitting a new issue make sure to complete these steps:

• [X] Checkout the dev branch and confirm the issue is present there as well. The dev branch contains fixes that may not have been merged to master yet.

• [X] Post the syntax you are using (default/mediawiki/markdown) and your vimwiki settings from your .vimrc

  let g:vimwiki_list = [{'path': '~/sparkleup/do/',
                      \ 'auto_tags': 1, 'auto_diary_index': 1, 'auto_export': 1,
                      \ 'path_html': '~/sparkleup/do_html/',
                      \ 'template_path': '~/sparkleup/do_html',
                      \ 'syntax': 'markdown', 'ext': '.md',
                      \ 'list_margin': 0,
                      \ 'nested_syntaxes': {'vimwiki': 'markdown'},
                      \ 'custom_wiki2html': 'vwmd'},
  

• [X] Provide a detailed description of the problem including steps to reproduce the issue.

  • Create a numbered list of checklist items with more than 9 items.
  • Expected: The checklist boxes to be highlighted for all items
  • Actual: Checklist highlighting stops as soon as there are more than two digits in the item number

  

• [X] Include the output of :VimwikiShowVersion.

  Os: Linux
  Vim: 800
  Branch: dev
  Revision: 4d7a4da
  Date: 2021-12-19 00:49:16 -0300
  

  Running VIM - Vi IMproved 8.2 (2019 Dec 12, kompilita Feb 24 2022 16:42:38)